TY - JOUR AU - Urszula WilczyƄska TI - Approximate of functions of two variables JO - Fundamenta Mathematicae PY - 1979 SP - 98 EP - 109 VL - 104 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/fm-104-2-98-109/ DO - 10.4064/fm-104-2-98-109 LA - en ID - 10_4064_fm_104_2_98_109 ER -